Fix the sqlite3_bind_blob() interface (and its kin) so that the destructor

is invoked if the binding fails.  Ticket [860399cc408f2dd5f41aed44b]
Update the documentation to explain which interfaces invoke their
destructors on failure and which do not.

FossilOrigin-Name: d3c95e3a4e08d08028e9bc7f282074e32b9cf950

src/vdbeapi.c

@@ -1022,6 +1022,8 @@ static int bindText(
       rc = sqlite3ApiExit(p->db, rc);
     }
     sqlite3_mutex_leave(p->db->mutex);
+  }else if( xDel ){
+    xDel((void*)zData);
   }
   return rc;
 }